package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


@Service
@Slf4j
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    // 微信接口服务的地址
    public static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openId = getOpenId(userLoginDTO.getCode());

        // 判断openid是否为空，为空则登录失败
        if(openId == null || openId.equals("")){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断是否是新用户，
        User user = userMapper.getByOpenId(openId);

        // 新用户则将openid存起来，需要自动完成注册
        if(user == null){
            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }else {
            log.info("we find a user:{}", user.getOpenid());
        }

        //返回用户对象
        return user;
    }


    /**
     * 调用微信接口服务获取openid
     * @param code
     * @return
     */
    private String getOpenId(String code) {
        // 调用微信接口服务，获得openid
        //构造发送服务请求所欲的数据
        Map<String, String> map= new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret() );
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        //返回值的类型为json
        String json = HttpClientUtil.doGet(WX_LOGIN_URL, map);
        //解析json数据把openid取出来
        JSONObject jsonObject = JSON.parseObject(json);

        return jsonObject.getString("openid");
    }
}
